tests.rb

#----------------------------------------------------
#          tests.rb
#----------------------------------------------------


require 'test/unit'
require_relative 'CarImport'
require_relative 'FileParser'

class TestAsserts < Test::Unit::TestCase
        def test_initialize
                car1 = CarImport.new("Toyota")
                assert_equal "Toyota", car1.car_type
        end

        def test_FileParser
             assert_equal " e\n", FileParser.find_line('example_file.txt', 2)
        end
end

# --------------------------------------------------------------------------


The error when I attempt to run `ruby tests.rb`
tests.rb:2: undefined method `require_relative' for main:Object (NoMethodError)